[LS short box]

As said above get a length of 5/8" threaded rod. Long enough to run from the lower a-arm to the top mount running inside the spring. Piece of plate steel on either end. Add a piece of chain around the frame to hold the spring in place if it tries to get away from you. Tighten the threaded rod until you can bolt in the ball joints. I typically weld nut to one end of the treaded rod.